`in` (containment) operator

The non-associating, binary infix in operator is used to test whether its left-hand operand is contained in its right-hand operand

Usage

void m(Object x, Category y) {
    Boolean contained = x in y;
}

The in operator is defined as follows:

lhs.contained(rhs);

See the language specification for more details.

The in operator is polymorphic. The meaning of in depends on the Category interface

The result type of the in operator is Boolean.